Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
It's not a lichen it is a type of encrustation small bracket fungi,worth scoring the surface with a knife as one of these turns red when cut.I think it may be one of the Stereum's but not sure which.
Hope this help's
Thanks for taking the time to comment - very helpful.
Sorry I cannot help with your other observation but I am not that good at lichen's it's fungi that I study but there are a couple of good lichen people who will hopefully be able to help you.
Lat/Lng: 55.9176, -5.4248
OS grid ref: NR860746